Can I use VoIP at home and a prepay service outside with same number?

Hmm... After doing a ton of searching over the net, I cannot seem to find a simple answer to this.

I want to setup to a prepay plan for my daughter. After doing a lot of research I have settled on using a used AT&amp;T iPhone 4 with the Straight Talk plan from Walmart. But ther is one problem. Straight Talk uses the at&amp;t network and we have no reception at home.

So I would like to phone automatically switch to using wifi when at home, just like it does for data. From what I understand, this means getting a VoIP system going somehow. But when I go to the app store the number of VoIP apps is bewildering. I would like to use something that will make it completely transparent, ie keeping the same iPhone number, being able to text msg and all. Is that possible? Can I do that with a known quantity like Skype or vonage? Is there some extra hardware required? Can I keep my number? Any other recommendation?

My ISP is Cox communications and my wifi is through an Aiport Extreme.

That's exactly what my blogpost says to do. The problem I was having was automatically forwarding my calls when my phone is not available, which is a simple code I found on another blog which I linked to with clear instructions on how to set up the whole process.

I second Tim's recommendation for Google Voice. You can have it foward to the prepaid number if you don't/can't answer it over WiFi. It's very simple to use. So, you could just give out the Googe Voice number. It's very simple to use.

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